Some standard content:
ICS 29. 130. 10, 29. 130. 99
National Standard of the People's Republic of China
GB1985-2004
Replaces GH1985--.1989, GR/T 13601—1992 High-voltage alternating-current disconnectors and earthing switches
High-voltage alternating-current disconnectors and earthing switches (IEC 62271-102:2002 High-voltage acillary-current disconnectors and earthing switches, MOD)
Published on 2004-05-14
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
Implementation on 2005-02-01
All technical contents of this standard are mandatory (except terms and definitions). GB1985—2004
This standard is a comprehensive revision of GR1985-1989 AC high voltage disconnectors and earthing switches based on IEC62271-102:2002 (1st edition) High voltage AC disconnectors and earthing switches. IE62271-102, 2002 replaces IEC60129, 1984. The consistency between this standard and IFC62271-102:2002 is modified and adopted. The main differences between this standard and IEC62271-102,2002 are as follows: Scope of application: According to the actual situation of my country's power grid, the rated frequency of 60Hz in IEC 62271-102:2002 is removed; According to the division of labor in my country's industry, the minimum voltage applicable to idle equipment is changed from 1000V in IEC52271-102:2002 to 3.6 kV,
… Rated voltage: The values irrelevant to my country's power grid are removed. According to the values listed in GB/T110221999, the normative references listed in this standard also adopt IEC standards, but the degree of adoption is different: - The rated short-circuit duration of the earthing switch is clarified to be 25; The static mechanical load value of the fixed terminal of the disconnector is modified; The rated value of the mechanical life of the earthing switch is clarified: - In 6.1.1, the operation and mechanical life test and GB/T 11022 are clarified The type tests given in the IEC 62271-102:2002 are mandatory type tests; the "non-mandatory type tests" listed in this clause of IEC 62271-102:2002 are changed to "mandatory type tests when applicable"
~-According to Appendix D., the withstand voltage values of 126kV, 252kV, and 363kV of rated voltage in Table 5 are revised: a pair of indoor disconnectors and earthing switches, the requirements for condensation tests are added; -.- The qualified criterion of radio interference test is changed to: the radio interference level under 1.1U,./3 shall not exceed 2000=V; --~- IEC 62271-102:2002 is changed to: the radio interference level under 1.1U,./3 shall not exceed 2000=V; :2002's Figure 5 is swapped with Figure 6, and it is specified that when testing according to Figure 5, the rated terminal static mechanical load to be applied is water longitudinal
-.. In 6.102.3.2, according to E.6.102.3, the verification of the interlocking of the grounding switch equipped with interlock is added...-According to my country's needs, the factory rated busbar transfer voltage value is modified and supplemented: According to my country's needs, Appendix G
is added to the differences between the wooden standard and IEC62271-102:2002. In the blank space on the margin of the main text of this standard, the position of the relevant modified provisions is marked with a vertical single line ()).
The main differences between this standard and GB1985-1989 are: Differences in standard systems: When my country adopted IEC60129:1984 equivalently, it divided IEC60129:1984 into two standards, namely GB 1985..1989 and GB/T 136011S92. Later, IEC published IFC 61128:1992 (corresponding to my country's JB/T64621952), IEC61129:1992 (corresponding to China's JB/T64611992) and IFC61259:1994. This standard includes the contents of the above standards: 1. It clarifies that the isolating switches and earthing switches in enclosed switchgear belong to the scope of this standard: the rated voltage has been modified in accordance with the provisions of GH/T11022·1999, and 800kV has been added according to the needs of development. The relevant parameters are as follows:
~ The terms used and given have been greatly increased, such as MO-level, MI-level, M2-level isolating switches, EO-level, E1-level, E2-level earthing switches, parallel insulators, etc.:
"The rated terminal static mechanical load of the isolating switch and earthing switch, the rated contact area of the single-column isolating switch and earthing switch, and the force required for manual operation have been modified! The isolating switch with a horizontal isolating break equipped with an earthing knife is given. The 1 min power frequency withstand voltage when the earthing knife is temporarily close to GB1985--2004
;
- The requirements for the protection level of the shell, creepage distance, flammability and electromagnetic compatibility have been added to build GB The contents of IEC62271-1985-1989, such as the size requirements and interchangeability of the manual operating mechanism parts, the rated values and test methods of the operation and mechanical life test, the grounding life test, etc., were added: the voltage test as a state test was added, and specific requirements were given: ...--The grouping of products, the information used to confirm the test products, and the information included in the type test report were added; Chapter 8 "Selection principles for disconnectors and earthing switches" and Chapter 9 "Information to be provided with orders, bids and orders" were added; Chapter 1 "Safety": Appendix A, Appendix B, Appendix D, Appendix E, and Appendix F were added. The indentation order of chapters and clauses in this standard is consistent with IEC62271-102:2002. This standard should be used together with GB/T11022 issued in 1999. Unless otherwise specified in this standard, this standard shall comply with GB/T 11022. In order to simplify the expression of the same requirements, the chapter and article numbers of this standard are the same as those used in GB/T11022. Supplements to the contents of these chapters and articles are given under the same applicable titles, and the additional articles are numbered starting from 10. Appendix A, Appendix B. Appendix C, Appendix E and Appendix F of this standard are normative records, and Appendix D and Appendix G are informative records. From the date of implementation, this standard will replace GB1985-1989 and GB/T18601-1992 at the same time. This standard was proposed by the China Electric Power Industry Association. This standard is under the National Technical Committee for Standardization of High Voltage Switchgear. Chapter-making units and members of this standard:
Responsible drafting unit: Shenyang Yang High Voltage Switchgear Co., Ltd.: Yang Dakun, Zhenlixiu, Boxiuheng, Zhang Shu, Dinghai, Liu Bozhu, Yang Yingjie. Drafting staff: Xi'an High Voltage Electrical Equipment Research Institute: Yan Yulin, Wang Ping: China Electric Power Research Institute High Voltage Switchgear Research Institute: Gu Guanhong, Cao Jiang: Xi'an Xikai High Voltage Electric Co., Ltd.: Zhou Youxun, Wu Yuchi, Pingxiangshan Tianying Group Co., Ltd.: Qipinzhen, Liu Diofen; Beijing Beikai Electric Co., Ltd.: Lu Guoping, He Zhimeng: Fushun Gaoyue Switchgear Co., Ltd.: Bangxue: Chongqing Commercial Voltage Switchgear Factory: Jin Zhiling, Chen Lu; Hubei Switchgear Factory: Jiaxing;
Han Home Appliances Company Northeast Company Yu Bo;
State Power Corporation East China Company: Liu Zhaolin. The main drafters of this standard: Yang Daju, Gai Yucan, Zhang Zhu, Yan Baolin, Gu Bahong. This standard replaces the previous versions of the standard issued as follows: GB/T 1985-1980. GB/T 13601-1992. 1 Overview 1.3 Scope High-voltage AC disconnectors and earthing switches GB 1985-2004 This standard applies to AC disconnectors and earthing switches designed for installation indoors and outdoors, with closed and open terminals, rated voltage of 3.5kV and above and operating frequency of 50 Hz and below. This standard also applies to the motors and auxiliary excitation equipment of these disconnectors and earthing switches. The additional requirements for disconnectors and earthing switches in enclosed switchgear and control equipment are specified in (B 3906, (GB 7674 and 1E60466:
To: This standard does not cover fuses as separate components. 1.2 Normative references
The clauses in the following documents become clauses of this standard through reference in this standard. For all referenced documents with a date, all subsequent amendments (excluding errata) and revisions are not applicable to this standard: however, the parties involved in the design of the vehicle are encouraged to study whether the latest version of this document can be used. For undated referenced documents, the latest version is applicable to this standard. GB/T311.22002 Insulation coordination Part 2: Insulation coordination for high-voltage power transmission and transformation equipment (eqvIEC600712.1996)
CB/18042000
General case linear and angular dimensions without case notes (1V152768-1:1989) GB/2900.20-1994 Electrical 1 Terminology High-voltage switchgear (neIFC 6000) GB 3804-20013.6 kV~-40.5 kV high-voltage AC load step-up switch (1EC 60265-1:1998, M0D) GB390619913~-35kV Porcelain Enclosed Switchgear (neuIFC60298:1990) GBT1109-1999 High Voltage Bushing Input Conditions (e4vE060137:1) GB4208-1993 Protection Degree of Enclosure ([P Code]) (e1IFC60529:1989) GB/T5582-1.993 External Insulation Pollution Level of High Voltage Power Equipment (ncqIEC60815:1986) GB/T7354--2003 Front Discharge Measurement (IECG027 0:2000,IDT)GB7674-199772.5k and above gas-insulated metal-enclosed switchgear (eqV1EC60517:1990)GR/T11022-1999Common technical requirements for high-voltage switchgear and control equipment (cgV1EC60694:1996)GB/T14810-1993110kV and above AC high-voltage load switchgear (nrqIFC63265-2:1988)IFC:60466:1987 Rated voltage 1kV and above to 38kV AC insulated enclosed switchgear and control equipment in accordance with IEC 60851:1993 Short-circuit irrigation - Calculation of effects Part 1 - Part 1: Definitions and calculation methods 2 Normal and special conditions of use
Chapter 2 of GB3/111022 applies
3 Terms and definitions
Chapter 3 of 6B/111022 applies, with the following additions This chapter contains the required definitions, most of which refer to GB/T 29[.20.3.1
General terms
3. 1. 101
Indoor switchgear and controlgear indoorswitchgearandcuntrulgeur Switchgear and controlgear designed to be installed only in buildings or other shelters, where they can protect switchgear and controlgear GB 1985-2004
Equipment is protected from wind, rain, snow, abnormal deposition of dust, abnormal condensation, ice and frost. 3.1.102
Outdoor switchgear and controlgearOutdoor switchgear and controlgear is suitable for outdoor installation, i.e. it can withstand wind, rain, snow, abnormal deposition of dust, condensation, ice and frost.
3.1.103
Temperature rise ofapartofadisconnectororearthingswitch)
The difference between the temperature of a component and the temperature of the surrounding air.
User
The individual or legal body that uses a disconnector or earthing switch. Note: Users may include the purchaser of the disconnector or earthing switch (e.g. electricity supplier), as well as the contractor, the person responsible for installation, maintenance or operation, or other person responsible for the disconnector, earthing switch or substation for a short or long period of time, or even the operator of the switchgear. 3.2
Assemblies of switchgear and controlgear are not specifically defined.
Assemblies or parts of assemblies are not specifically defined.
Switching devices
Disconnector
Disconnector
Subsections 3 and 21 of GB/T 2900.20 apply. The following notes are added: Note 1: "Negligible currents" means such currents as the capacitive currents of bushings, busbars, connecting wires, very short cables, the currents of the grading impedances permanently connected to the circuit breaker, and the currents of voltage transformers and voltage dividers. According to this definition, when the rated voltage is 363 kV and below, a current not exceeding 0.5 A is a negligible current; when the rated voltage is 550 kV and above and the current exceeds 0.5 A, the manufacturer should be consulted. "No significant change in voltage" refers to the situation where the inductive voltage regulator or circuit breaker is disconnected. Note 2: For disconnectors with a rated voltage of 72.5 V and above, the specified performance of the busbar switching current may be specified. 3.4.101.1
Mo class disconnectors disconnectorclassMo have a mechanical life of 1000 operating cycles and are suitable for use in transmission and distribution systems and meet the general requirements of this standard. 3.4.101.2
M1 class disconnectors disconnector elass M1 have an extended mechanical life of 2000 operating cycles and are mainly used in situations where disconnectors and circuit breakers of the same rating are operated in conjunction.
3. 4. 101.3
M2-class disconnector class M12 is a disconnector with an extended service life of 10,000 operating cycles, mainly used in the occasions where disconnectors and circuit breakers of the same level are operated in conjunction.
Single-column disconnector earthing switch) G3/12900.20 3.25
Note: For example, the semi-telescopic disconnector. 3.4.103
dopple-column disconnector[3.26 of GB/T 2900.20]
3.4.104
threc-column disconnector[3.27 of GB/T 2900.20]
3.4.105
earthing switch
3.28 of GB/T2909.20) is applicable, with the following additions: Note: earthing switches with rated voltage of 72.5 kV or less may have rated values for opening and closing and carrying current. GB 1985—2004
Class E1, E2 and E3 of GB 3804 are based on the electrical life of load switches and isolating load switches. As a normal operating mode, these switch devices may sometimes be required to operate under short-circuit conditions. At the same time, electrical life may be a measure of "low maintenance". 3. 4. 105. 1
ED class earthing switch earthing switch class E0 is suitable for use in power transmission and distribution systems and meets the general requirements of this standard. 3. 4. 105. 2
E1 class earthing switch earthing switch class E1 has short-circuit closing capability. Note: This class of earthing switch can withstand two closing operations at the rated closing current. 3. 4. 105. 3
F2 class earthing switch
earththing gwitch clas9 F2
E1 class earthing switches suitable for use in systems up to 35 kV with extended short-circuit closing operations and requiring minimal maintenance:
Note: Five closing operations at rated closing current are performed to demonstrate that the maintenance requirements of this class of earthing switches can be reduced and minimal maintenance is required, such as lubrication (air replenishment and cleaning of external surfaces, if applicable). 3.5
Parts of switching devices3.5.101
Pole of a switching device switching device Part of a switching device associated only with an electrically independent conductive path of the switching device circuit. It does not include those parts that provide for the installation and operation of all poles together. Note: If the switching device has only one pole, it is called a single switching device. If there are more than one pole, as long as these poles can be operated together, it is called a multi-pole (two-pole, three-pole, etc.) switching device.
Main circuit (of a switching device) All conductive parts of the switching device included in the combined and separated circuits. 3.5.103
Contacts of a mechanical switching device [GB/T 2900. 20 4.1-
Main contact
[GB/T 2900, 20 4.4]
Control contact
[GB/T 2900.20 4.6]
GB 1985--2004
“a” contact make contact (with break contact)“a\ contact make contact
[GB/T 2900. 20 4.8]
“b” contact break contact (normally closed contact)“b” contactbreakcontact[GB/T 2900. 20 4.4] 9]
position signalling deviceposition signalling deviceA component of a disconnector or earthing switch which indicates by auxiliary energy whether the contacts of the main circuit are in the open position or in the closed position: 3.5.109
Terminal (as a component)Terminal (as a contact)Component used to connect the device to an external conductor. 3.5.110
Contact zone (for single-column disconnectors and earthing switches)Contact zone (for single-column disconnectors and earthing switches)The spatial area in which the stationary contact can occupy the position in order to make the stationary contact with the moving contact correctly. 3.6
Operation operation (of a mechanical switching device) operation (of a mechanical switching device) 5.1J of LGB/T 2900, 2002
Operation cycle (of a mechanical switching device) operation cycle (of a mechanical switching device) [GB/T 2900, 2002 5.5 of GB/T 2900.20]
(Closing operation (of a mechanical switching device) [5.3 of GB/T 2900.20]
(Opening operation (of a mechanical switching device) [5.2 of GB/T 2900.20]
3.6.105
Positively driven operation_3, 6.33 of GB/T 11022
(Mechanical switching device) Manual operation dependentmanual operation (of a mechanical switching device) 5.S of GB/T 2900.20 is applicable, with the following additions: NOTE: Manual operation may be performed by means of a lever or a probe (horizontal or vertical). 3.6.107
(Power-dependent power operation (of a mechanical switching device) GR/T 2900.20, 5.10]
3.6.108
(Stored energy operation (of a mechanical switching device) Operation performed with the help of energy stored in the mechanism itself before the opening and closing operation and sufficient to complete the specified operating cycle under predetermined conditions.
GH 1985--2004bZxz.net
Independent operation (of a mechanical switching device)
[GB/T 2900. 20 5.12]
[Closed position (of a mechanical switching device)] GB/2900.20 5.32 is applicable. With the following supplement: Note: The intended continuity refers to the position in which the contacts can be fully in contact and can carry the rated current and rated circuit (if applicable). 3.6.111
Open position (of a mechanical switching device) [GB/T 2900.20 .33]
Interlocking device device
device making the operation of a switch dependent on the position or action of one or more other parts of the device. 3.7
characteristic quantities
peak making current (of an earthing switch)peak making current (of an earthing switch) the peak value of the first half-cycle of the current in one pole of the earthing switch during the transient period after the onset of current during the making operation. NOTE Unless otherwise stated, in this context, for three-phase circuits, a single value of the (peak) making current is the maximum value of the quantity in any one phase. 3.7.102
peak currentpeak current
the peak value of the first half-cycle of the current during the transient period after the onset of current. 3.7.103
normal current (of a disconncctor)
normal current (of a disconncctor) The current that the main circuit of a disconncctor can carry continuously under specified conditions of use and performance. 3. 7. 104
short-time withstand currentThe current that the switchgear in the same circuit and in the partition position can carry in a specified short time under specified conditions of use and performance. 3.7.105
peak withstand currentThe peak current that the circuit and the switchgear in the closed position can withstand under specified conditions of use and performance. 3.7. 106
rated value
The parameter value specified by the manufacturer for parts, devices or equipment under specified working conditions. 3.7.107
Insulation levelinsulation level
The test voltage that the insulation of the device is designed to withstand under specified conditions. 3.7.108
1 min power frequency withstand voltagepneminule pwer frequency withstand voltageThe effective value of the power frequency sinusoidal AC voltage that the insulation of the disconnector or earthing switch withstands under specified test conditions: 3.7.109
impulsewithstadvoltagcThe peak value of the impulse voltage wave that the insulation of the disconnector or earthing switch withstands under specified test conditions. GB1985—2004
Note: Depending on the waveform, this term can be limited to the impulse withstand voltage or the lightning impulse withstand voltage. 3.7.1t0
External insulationexlernul insulation
The solid insulating surface of a leakage current or earthing switch in contact with air, subject to the influence of the atmosphere and other external conditions (such as pollution, moisture, noise, etc.). Note: External insulation can be either extremely weatherproof or non-weatherproof, designed for use outdoors or in closed shelters, respectively. 3.7.111
Internal insulationinternal insulation
The internal solid, corrugated or bulk insulating part of the equipment insulation: it is not subject to the influence of air and other external conditions. 3.7.112
Self-regulating insulation: insulation that can fully restore its insulation properties after a destructive discharge. 3.7.113
Non-self-restoring insulation: insulation that loses its insulation properties or cannot fully restore its insulation properties after a destructive discharge. Note: The provisions of 3.7.111 and 3.7.113 apply to the case where the test voltage is applied during the insulation test to cause an over discharge. However, discharges caused in service may cause self-restoring insulation to partially or completely lose its original insulation properties. 3.7.114
Parallel insulator parallelinsulation refers to the situation where the insulator arrangement consists of two insulators in parallel, and the distance between the two insulators may affect their insulation strength. Note 1 For disconnectors and earthing switches with open terminals, if the operating (sudden action) insulator is close to the supporting insulator, it becomes a parallel insulator. 3.7.115
disruptivedischarge phenomenon associated with insulation failure under voltage. In this case, the insulation under test is completely bridged by the discharge, causing the voltage drop between the electrodes to reach zero or close to zero.
Note! This term applies to discharges in solid, liquid and gaseous media and their combinations! Note 2: Disruptive discharges in solid media lead to permanent loss of insulation strength (non-recovery insulation); while in liquid or gaseous media, the loss of insulation strength may be only temporary (self-recovery insulation).
3.7.116
Clearance
The straight-line distance between two conductive parts along the shortest path between these conductive parts. 3.7.117
clearance between poles the clearance between any conductive part of an adjacent pole 3.7.118
clearance to earth the clearance between any conductive part and any part which is earthed or intended to be earthed. 3.7.119
clearance between open contacts GB/I 2900.20 5.22 applies with the following note: Standard: The total clearance should be determined taking into account the sum of the openings of the various sections. 3.7.120
isolating distance (of apole of a mechanical switching device) the clearance between open contacts which complies with the safety requirements specified for the disconnector. 3.7.121
mechanical load mechanical! terminus kad the external load acting on each terminal. GB 1985-—2004
Note 1: The external load is the mechanical force that the disconnector or earthing switch may bear. It does not include the wind force acting on the equipment body, because they do not constitute the external load of the terminal.
Note 2: The disconnector or earthing switch may bear several mechanical forces with different sizes, directions and points of action: Note: The terminal load defined in this way is not applicable to closed-type equipment. 3.7.121.1
Terminal static mechanical load staticmechanical terminal load The static mechanical load on each terminal is the mechanical force that the terminal bears when the soft wire or hard wire of the disconnector or earthing switch is connected to the terminal.
3. 7. 121. 2
Dynamic mecanica terminal loaddynamic mecanica terminal loadThe combined load of static mechanical load and electromagnetic force under short-circuit conditions3. 7. 122
Bus transfer current switchingbus transfer current switching is not the breaking of the load, but the breaking and closing operation performed under interruption conditions when the load is transferred from one bus to another.
3. 7. 123
Switching and closing induced carrent switchingThe operation of using an earthing switch to break and close inductive or capacitive currents, which are currents induced by parallel commercial voltage lines in the grounded or ungrounded lines.
Note: When two or more transmission lines are installed together on a line tower, or when two or more lines are installed on adjacent unconnected poles, the energized line will produce electromagnetic induction and electrostatic induction energy on the unenergized line. The unenergized line is grounded at one end or at both ends, and capacitive or inductive current will flow in the unenergized line. 4 Rated values
Chapter 1 of GB/T11022 is applicable, and the following supplements are made to the list of rated values: k) Rated short-circuit making current (only for earthing): Rated contact area (only for single-column disconnectors); 1
Rated terminal mechanical load:
For rated voltage 73.5 kV and above n) Rated value of busbar transfer current switching capacity of disconnector; ) Rated value of inductive current switching capacity of disconnector 4.1 Rated voltage (U.)
4.1 of GB/T11022 is applicable
4.2 Rated insulation level
4.2 of GB/T11022 is applicable, and the following supplements are made: For disconnectors with the isolating break parallel to the base and integrated with the earthing switch, if the minimum interval is 1 min below If the power frequency withstand voltage is not lower than that specified in 6.2, 5, it is considered that the safety requirements are met during the temporary proximity of the live parts of the grounding switch with the opposite side.
Note 1: Except for the short time when the grounding switch is operated with only a manual operating mechanism, the temporary reduction of the insulation strength is not a common problem of safety requirements. Because of this, and without considering aging, low insulation strength is acceptable. Because the efficiency of lightning and hand-held impulses in the grounding column is very low, impulse current zone tests are not required. Note 2: For grounding switches with only manual operating mechanisms, if the national safety regulations stipulate a higher withstand voltage value, it can be negotiated between the user and the manufacturer.
Note 3: If the minimum temporary electrical clearance is greater than the electrical clearance given in GB/T311.2, no test is required. For the rated insulation level of the transformer neutral point grounding disconnector, refer to Appendix G. 4.3 Rated frequency (f)
4.3 of GB/T 11022 applies.
4.4 Rated current and temperature rise
4.4 of GB/T11022 applies. This clause is generally applicable to disconnectors. Note: Skin efficiency should be considered according to the shape, structure and material of the main current path of the disconnector. Experience shows that the temperature rise of a rectangular conductor operating at 50 Hx deviates by more than 5% compared with 50 Hz. 4.5 Rated short-time withstand current (1)
4,5 of GB/111022 applies, with the following additions; if the earthing switch and disconnector are combined into one, unless otherwise specified, the rated short-time withstand current of the earthing switch shall be at least equal to! 4.6 Rated peak withstand current (f,)
4.6 of GB/T11022 applies, with the following supplement # If the earthing switch and the isolating switch are combined into one, unless otherwise specified, the rated peak withstand current of the earthing plate switch shall be at least equal to the rated value of the isolating switch
4.7 Rated short-circuit duration ()
4.7 of GB/T 11022 applies, with the following supplement: Unless otherwise specified, the rated duration of the short-time withstand current of the earthing switch is 2s. 4.8 Rated power supply voltage (U,) of the switching and disconnecting devices and the auxiliary and control circuits GB/T 11022 4.8 applies.
4.9 Rated power supply frequency of the switching and disconnecting devices and the auxiliary circuits GB/T 11022 4.9 applies,
4.10 Rated pressure of compressed air source for insulation relief and/or operation 4.10 of GB/T 1022 applies.
4.101 Rated short-circuit making current
For grounding switches with rated short-circuit making current, they should be able to make any externally applied voltage up to and including its rated positive voltage and any current up to and including its rated short-circuit making current. If the grounding switch has a rated short-circuit making current, it should be equal to the rated peak withstand current. 4.102 Rated contact area
The manufacturer should specify the rated value of the contact area (expressed in, and = meters). The values in Tables 1 and 2 are for reference only: the rated values should be obtained from the manufacturer. The contact area is related to the allowable static offset of the static contact. For the correct function of the disconnector or earthing switch, the operating conditions should be taken into account when determining the substation design and the bending strength of the insulator to ensure that the static contacts are within these limits (see 8.102.3). Table 1 Recommended contact area when the static contacts are supported by flexible conductors Rated voltage i./kv
Rated voltage
Total amplitude of longitudinal displacement of the supporting conductor (influence of wind); Table (continued)
y-total horizontal deviation (deviation in the vertical direction from the supporting conductor) Influence of wind) : - vertical displacement (effect of temperature and ice), Note: When the static contact is fixed by a soft conductor, the value of 21 is applicable to short spans, 2: for long spans, 21/mm
Recommended contact area when the static contact is supported by a conductor Table 2
Rated voltage U./V
252,363
Total amplitude of longitudinal displacement of the supporting conductor (effect of temperature), 3 - Horizontal total displacement (deviation from the vertical direction of the supporting conductor) (effect of wind) = vertical displacement of ice).
4.103 Rated terminal mechanical load
The rated terminal mechanical load shall be specified by the manufacturer. y/mm
The disconnector and earthing switch shall be able to close and open when subjected to the static mechanical load at their rated terminals. GB 1985—2004
Under the most unfavorable conditions, the maximum terminal static mechanical load that the disconnector or earthing switch is allowed to withstand is sufficient to meet the rated terminal static mechanical load of the disconnector.
The recommended rated terminal static mechanical loads are given in Table 3. And use them as a guide. The maximum external dynamic mechanical load that the terminals of the disconnector or earthing switch are allowed to withstand is the rated dynamic mechanical load of the disconnector.
Under short-circuit conditions, the disconnector and earthing switch should be able to withstand their rated terminal dynamic mechanical load. The rated value of the mechanical load of the disconnector or earthing switch terminal depends not only on its design, but also on the strength of the insulator used for it
The required bending strength of the insulator should be calculated. The calculation should take into account the location of the terminal on the insulator face and the attachments to the insulator (see 3.7.12 and 8.12.4). Table 3 Recommended rated terminal static mechanical loads Double-column or three-column disconnector
New rated load
Rated extended load: A
Horizontal longitudinal load
F and FN
Basic horizontal longitudinal load
Fi and Fa/N
Single-column disconnector
Basic horizontal longitudinal load
FI and Fh./N
Basic horizontal transverse load
See Figure 8
Vertical force
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